Beer keg

ABSTRACT

A beer keg having the top, bottom and side walls made of plastic, and tapper and filler plug mounting members made of plastic or metal which in one embodiment are cast in position as the top and side walls are formed. In the second and third embodiments, the filler plug mounting member is retained in the central part of the keg mold as the keg is molded and thereafter mounted in a filler opening formed in the keg.

I United States Patent 11 1 1111 3,825,145 Reynolds [4 July 23, 1974[54] BEER KEG 2,624,486 1/1953 Lee 220/5 R 2,983,403 5/l96l Mauser220/63 [75] inventor 'F Reynolds Bumsvnet 3,279,640 10/1966 Dodson 220/5R 3,468,450 9/1969 Webel 220/27 [73] Assignee: Huck Finn, Inc., SpringLake Park,

Primary ExaminerWilliam I. Price 22 Filed; 0, 13 72 AssistantExaminer-Steven M. Pollard Attorney, Agent, or Firm-Dugger, Johnson &[2i] Appl. No.1 298,469 westman Related US. Application Data [63]Continuation-impart of Ser. No. 217,306, Jan. 12,

1972, which is a continuation-in-part of Ser. No. ABSTRACT 58,341, July27, i970, abandoned.

A beer keg having the top, bottom and s1de walls 521 vs. c1. 220/1 R,220/39 R, 220/70, made of plastic, and pp and filler P s mwmins 220/33members made of plastic or metal which in one em- [5 1] int. Cl 8651!1/20 bodimem are cast in Position as the P and side Vans 5 Field Search220/1, DIG 1, 7 7 are formed. in the second and third embodiments, the220 5 R 27 1 R filler plug mounting member is retained in the centralpart of the keg mold as the keg is molded and thereaf- 5 ReferencesCited ter mounted in a filler opening formed in the keg.

UNITED STATES PATENTS 14 Claims, 21 Drawing Figures 1,986,447 1/1935Rishel 1. 285/39 PATENTED JUL 2 31974 sum 1 or 4 FIE. E

BEER KEG RELATED APPLICATIONS This application is a continuation-in-partapplication of my application Ser. No. 217,306, filed Jan. l2, I972.which in turn is a continuation-in-part application of my applicationSer. No. 58,34l, filed July 27, I970, now abandoned.

BACKGROUND OF THE INVENTION A keg for beer. In the prior art it is oldto make metal kegs, for example for aluminum for storing beer, andprovide an opening in the side wall of the keg and in the top wall ofthe keg in which a filler plug mounting member and a tapper plugmounting member are respectively subsequently mounted. However metalkegs are relatively heavy, relatively expensive to make, dent relativelyeasy and are noisy in handling. In US. Pat. No. 2,983,403 to Mauserthere is disclosed a barrel for beer that includes a thin wall innershell of metal or synthetic material that at the ends is provided withreinforcing rings, the shell and rings being covered by a layer 23 ofsynthetic material. However, such is not an integrally formed unit andnot as economical to produce as desired. In order to overcome objectionsof the above mentioned nature, as well as others, the present inventionhas been made.

SUMMARY OF THE INVENTION A beer keg h'aving plastic top, bottom and sidewalls that are of integral unitary construction, and a tapper mountingmember cast in position in the top wall and a filler plug mounted in theside wall.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of the firstembodiment of the beer keg of this invention;

FIG. 2 is an enlarged fragmentary cross-sectional view of the beer kegof FIG. 1 showing the joining of the top and bottom walls to the sidewall;

FIG. 3 is an enlarged fragmentary cross-sectional view generally takenalong the line and in the direction of the arrows 3-3 of FIG. 1 to showthe mounting of filler plug mounting member;

FIG. 4 is an enlarged fragmentary plan view generally taken along theline and in the direction of the arrows 4-4 of FIG. I to show themounting of the tapper plug mounting member;

FIG. 5 is a fragmentary cross-sectional view generally taken along theline and in the direction of the arrows 55 of FIG. 4;

FIG. 6 is a vertical cross-sectional view of the second embodiment ofthe beer keg of this invention, said view being generally taken alongthe line and in the direction of the arrows 66 of FIG. 8;

FIG. 7 is a top view gene rally taken along the line and in thedirection of the arrows 77 of FIG. 6',

FIG. 8 is a bottom view generally taken along the line and in thedirection of the arrows 8-8 of FIG. 6;

FIG. 9 is a side view of the tapper plug mounting member, said viewbeing generally taken along the line and in the direction of the arrow9-9 of FIG. 10',

FIG. I0 is a top view of the mounting member of FIG. 9, and view beinggenerally taken along the line and in the direction of the arrows 10-10of FIG. 9;

FIG. 11 is a fragmentary view of the filler plug mounting member of thesecond embodiment, said view being generally taken along the line and inthe direction of the arrows III1 of FIG. 6;

FIG. 12 is a fragmentary view generally taken along the line and in thedirection of the arrows 12-12 of FIG. 11;

FIG. 13 is a view of the retainer ring of the second embodiment that isgenerally taken along the line and in the direction of the arrows l3-I3of FIG. 14;

FIG. 14 is a side view of FIG. 13;

FIG. 15 is a fragmentary cross-sectional view showing the tiller plugmounting member of the second embodiment mounted in the central portionof the keg as the keg is being formed;

FIG. 16 is a fragmentary cross-sectional view of the third embodiment ofthe invention;

FIG. 17 is in part a side view and in part a crosssectional view of thefiller plug mounting member of the third embodiment, said view beinggenerally taken along the line and in the direction of the arrows I7 17of FIG. 18-,

FIG. 18 is a view of the filler plug mounting member of FIG. 17 that isgenerally taken along the line and in the direction of the arrow Ill-18of FIG. 17;

FIG. 19 is a view of the retainer ring of the third embodiment, saidview being generally taken along the line and in the direction of thearrows l919 of FIG. 20;

FIG. 20 is in part a side view and in part a crosssectional view of theretainer ring of FIG. 19, said view being generally taken along the lineand in the direction of the arrows 20-20 of FIG. 19; and

FIG. 21 is an enlarged, fragmentary cross-sectional view of the mountingmember and gasket thereon.

Referring to FIGS. 1-5, there is shown the first embodiment of the beerkeg, generally designated 10, of this invention. The keg 10 includes anannular side wall 11, a bottom wall 12 and a top wall 14. The top andbottom walls are fixedly joined to the opposite ends of the side wallswhereby there is provided a keg member 13.

In a central portion of the side wall there is provided an annularmounting member 16. Member 16 has a generally axially extending annularflange portion 16a that opens through the outer peripheral surface ofthe side wall and a radially extending, annular flange portion 1617having an outside diameter substantially greater than the outsidediameter of flange portion 16a. The plastic material of the side wallsurrounds theradially outwardly, axially extending surfaces of themounting member in sealing engagement therewith. Further the side wallincludes an annular portion integrally formed with the adjacent portionsof the side wall that covers a substantial part of the axially inner,radially extending surface of the mounting member. Thus.

flange portion 16b, other than for its juncture to flange portion 16a,is embedded in plastic material on all sides thereof. The filler member16 has a central aperture opening into the keg for filling the keg.

Mounted by the central portion of the top wall 14 is the tapper plugmounting member 20. Tapper member 20 has an axially extending, annularflange portion 20a and a radially enlarged flange portion 20b integrallyjoined to the axially inner end of flange portion 200. Thus the outerdiameter of flange portion 20b is substantially larger than the outerdiameter of flange portion a. The plastic material surrounds and is insealing engagement wite the exposed outer peripheral surfaces of flangeportions 20a, 20b and at least a substantial annular portion of theaxial inner surface of flange portion 20b. As may be noted, plasticmaterial 14b extends over the last mentioned surface. Thus the surfacesof flange 20b are covered by plastic material; is. flange 20b embeddedin plastic. Member 20 has a central aperture opening into the interiorof the keg. A pumping attaching portion 20c is joined to flange 20a toextend axially outwardly thereof, portion 20c having internal grooves(not shown) to have a tapper plug (not shown) removably secured inportion 200.

Referring to FIGS. 6-14, the second embodiment of the beer keg,generally designated 50, includes a top wall 51, a bottom wall 52 and aside wall 53 that is integrally joined to the adjacent edges of walls 51and 52 respectively to form a keg chamber 54. A top annular flange 57has its lower edge integrally joined to the top and side walls at thejuncture thereof, the outer edge of flange 57 being at a substantiallyhigher elevation than the maximum elevation of the top wall. Likewise, abottom annular flange 58 has its top edge integrally joined to thebottom and side walls at the junction thereof, the lower edge of thebottom flange extending to a lower elevation than the lowermost part ofthe bottom wall.

Generally radially extending reinforcing flanges 59 are integrallyjoined to the top wall to extend thereabove and to flange 57 to extendradially inwardly thereof at a maximum elevation lower than the top edgeof flange 57. Also radially extending reinforcing flanges 60 areintegrally joined to the bottom wall to extend therebelow and to flange58 to extend radially inwardly thereof at a minimum elevation above thebottom edge of flange 58.

Vertically spaced, exterior annular ribs 63, 64 respectively areintegrally joined to the side wall, the ribs being of the same size.Other than for flanges 58, 60, the exterior surface of the bottom wall,and the adjacent part of the side wall that is below flange 64 has aradius of curvature R emanating from point 65, i.e. the portionarcuately from line B to line B, is in the shape of a portion of asphere. Likewise, other than for flanges 57, 58 and the filler plugrecess, the exterior surface of the top wall and the adjacent part ofthe side wall that is above the flange 63 has a radius of curvature Semanating from point 66. Vertically between and slightly closer to point66 than point 65, there is a point 67, the horizontal dimension X frompoint 67 to the exterior surface of the sidewall being slightly greaterthan the dimensions of radii R, 8,; while the dimension W to theexterior surface adjacent the junctures of ribs 63, 64 respectively withthe side wall (between the ribs) is slightly greater than the dimensionX. Further the vertical distance from the top of rib 63 to point 66 isabout one-third of the distance from the top of the rib to the bottom ofthe rib 64 while the corresponding distance of point 65 is abouttwo-thirds of said distance between the ribs.

In the vertical central portion of the side wall (between ribs 63, 64),there is provided an annular plug mounting member, generally designated70; that includes an annular flange 71 that is of a substantially largerouter diameter than the externally threaded reduced diameter annularflange 72 and integrally joined thereto. The flange 72 extends through acircular aperture in the side wall portion while flange 71 has agenerally flat annular surface 73 to abut against a flat annular surfaceof the interior surface portion of the side wall surrounding flange 72.A plurality of circumferentially spaced, radially extending teeth 74 areintegrally joined to flange 71 to bite into the side wall to prevent themember turning relative the side wall. Member 70 has a frusto-conicalplug receiving aperture 77 that is of progressively smallercross-sectional areas in a direction toward the interior of the keg.Further, flange 71 has a tapered surface 76 extending between surface 73and the axially opposite surface which forms a close fit with acorresponding surface of the side wall. A retainer nut 78 is provided tobe threaded on flange 72 and abut against the exterior surface of theside wall to retain member 70 in position on the keg, member 78 havingspaced wrench cutouts 78a.

Mounted by the top central portion of the top wall 51 is the tapper plugmounting member, generally designated 80 (see FIGS. 9 and 10), that isof the same construction as mounting member 20 except that the radiallyenlarged flanged portion is provided with circumferentially spacedcutouts 810 that the plastic material of the keg extends into, toprevent rotation of member 80 relative to the keg. The top wall has acylindrical recess 51a of a substantially larger diameter than the outerdiameter of the annular flange portion 81b. The

top wall has an inwardly protruding portion 51b that mounts member 80with the top surface thereof recessed with reference to the continuationof exterior surface of the side wall in which recess 51a is formed. Thesame portions of member 80 are surrouned by plastic material of parts ofportion 51a as the portions of member 20 that are surrounded by plastic.

Preferrably a rotocasting process is utilized in making the kegs of thisinvention to provide kegs of a single layer of unitary, continuous wallsof plastic joined to one another to enclose the keg chamber other thanfor the openings for members 16, 20 and 80. In order to mount the fillerplug member 70 in place with the surface 73 abutting a correspondinginterior annular sur' face of the side wall and without the oppositeannular surface of flange 71 covered with plastic, the mold 89 usedincludes a tapered plug 90 having an inner flat surface of a larger areathan the outer surface (see P10. 15). Suitable attaching members 92 areprovided for removably attaching the plug to the remainder of the moldwhereby selectively the plug 90 is retained in a fixed position on themold, and the mold may be removed from the keg while the plug 90 is notremoved therefrom. An elongated rod 93 is mounted by plug 90 to extendradially inwardly to the central part of the mold, the inner end of therod mounting a block 94 having a frusto-conical surface to form a closefit with the member 70 wall that defines the plug aperture 77. Latchmembers 96 are mounted by block 94 for releasably retaining member 70unblock 94 but which can be turned by turning bolts 97 to permitwithdrawing the block 94 from member 70.

With powdered or granular uncured plastic material in the mold andmounting member 70 mounted in the central part of the mold by the abovestructure, the mold is simultaneously rotated about two axes and heated.During the rotation the plastic material adheres to the mold but not toblock 94 or member 70 since they are too cool for the powder to adhereto. After the rotocasting step, the mold (other than for plug 91) isremoved from the keg, then rod 93 pulled radially outwardly anappropriate distance and thence an aperture cut in the keg side wallthat is only slightly larger than flange 72. Next rod 93 is furtherradially moved to pull member 72 to extend outwardly of the keg, bolts97 turned to release latches 96 and block 94 removed from member 70. Nowthe retainer nut 78 is threaded on flange 72 to draw radial teeth 74into the keg side wall sufficiently that surface 73 forms a sealing fitwith the side wall. The shape of the mold is such that during thecasting step, the side wall adjacent plug 91 provides an inner kegsurface that subsequently forms a tight fit with the filler plugmounting surface 76 including a recess into which flange 71 fits.

As an example of the invention and not otherwise as a limitationthereof, dimensions R and S may be 7-11/32"; dimension W 7-19/32";dimension X 7-15/32"; the spacing of point 66 from point 65 l-7/8"; thespacing of point 67 from point 65 l-] H16"; and the maximum outerdiameters of each of flanges 57, S8 5-11/32".

Referring to FIGS. 16-21, the third embodiment of the invention includesa keg that advantageously is of the same construction as the keg of thesecond embodiment and includes an annular plug mounting member,generally designated 110, that is mounted in the side wall 109 of thekeg in the same place that plug 70 is mounted. Plug 110 has an annularflange 111 that is of a substantially larger outer diameter than theexternally threaded reduced diameter annular flange 112, flange 112being integrally joined to flange 111 to extend axially away therefrom.The flange 112 extends through a circular aperture 113 in the side wallwhile flange 112 has a generally flat annular surface 114 to abutagainst a flat annular surface of the interior surface portion of thekeg side wall surrounding flange 112, provided no gasket 135 isprovided. The axial length of flange 112 is substantially greater thanthe thickness of the keg wall portion defining opening 109. An annulartooth 115 is formed integral with flange 111, surrounds the flat surface1 14, is triangular in cross section parallel to the central axis ofbore 116 which extends axially through plug portions 111, 112, extendsaway from surface 114 in the same direction that portion 112 extendsaway from flange 11, and has an apex remote from surface 114. Thethreaded outer surface 112a of flange 112 is of generally circularcylindrical shape while the adjacent inner surface of tooth 115 is of acircular cylindrical shape. The radially outer surface of the tooth andflange 111 advantageously are co-extensive, frustoconical and aretapered to extend radially inwardly in the direction flange 112 extendsaway from flange 111. The wall defining plug bore 116 is of afrusto-conical shape and has a major base remote from flange 111. Spacednotches 120 are provided in the interior surface portion of flange 111that define the part of the bore extending therethrough to cooperatewith projections on a tool for holding the mounting member in positionin the aperture 113 while the retaining ring, generally designated 125,is being threaded thereon. As may be noted in FIG. 17, the notches 120terminate adjacent the juncture of flange 111 to flange 112 whereby,when a plug is placed in bore 116, no fluid passageway is provided topermit fluid escaping through from the keg between the plug and mountingmember. Further, the annular tapered surface 121 of flange 111corresponds to surface 76 and functions in the same manner.

The retainer ring, generally designated 125, is of a unitary, integralconstruction and has an internally threaded bore 127, the threads ofwhich form a mating fit with the threads of the outer surface portion offlange 112. Further, ring 125 has a flat annular surface 128, an annulartooth 129 having an apex edge remote from surface 128 that is ofsubstantially the same shape and size as tooth 114, and an annular flatsurface 130 surrounding tooth 129 and substantially coplanar withsurface 128, tooth 129 being radially between surfaces 128, 130. Theradially outer portion of the ring is provided with a plurality ofwrench notches 131.

Advantageously a gasket 135 may be provided on the mounting member toabut against surface 114 and extend between surface 112a and theadjacent surface of tooth 115, the thickness of the gasket beingsubstantially less than the axial height of tooth (the maximum distancethe tooth extends away from surface 114).

Preferrably the method of making the third embodiment is the same as thesecond embodiment. The nut is threaded onto the mounting member totightly clamp the keg side wall portion that extends therebetween theteeth or locking flanges 115, 129 which extend toward one another tobite into the side wall portion. Thus, the locking flanges form annulardepressions in the keg side wall portion with surface portions 128, 130,114 abutting against the adjacent surfaces of the keg side wall portion,if no gasket is provided; or if a gasket is provided surface portions128, 130 and the gasket abutting against the surfaces of the side wallportion. As a result of providing the teeth 115, 129 the side wallportion cannot pull away from the mounting member whereby fluid couldleak between the side wall portion and the mounting member. It is to bementioned the axial height of each of the annular teeth is many timesless than the thickness of the wall portion that they protrude into.

The filler and tapper plug mounting members of each embodimentadvantageously may be made of metal, for example stainless steel oraluminum, or the same type of plastic that the walls of the keg are madeof. In making the keg, the filler plug mounting members of the secondembodiment and the tapper plugs of both embodiments are mounted inposition in the mold and then the walls of the keg are formed wherebysaid mounting members are at least partially embedded as abovedescribed. Preferrably a rotocasting process is utilized in making thekeg, and that the type of plastic used is a highimpact polyethylene.

By using preformed plug mounting members and at least partiallyembedding them during the wall forming process as referred to above,such that plastic material extends over both inner and outer surfaceportions (relative the keg), a good fluid seal is formed and themounting members are firmly held in place. Further there is provided adurable, relatively light weight keg that can be used in the same manneras prior art kegs, but that is relatively inexpensive to produce.Additionally by making a keg of the shape of the second embodiment, itcan be used for storing beer under higher pressure than the keg of thefirst embodiment that has the same wall thickness.

In each of the embodiments, the filler plug aperture may be modified forreceivably retaining a twist-lock type of plug (not shown).

Further, with reference to the second and third embodiment, the retainerrings may be secured to the mounting member in a manner other than bythreading. For example, the outer surface 112a and the inner surface l27of the mounting member 110 and retainer ring 125 respectively may besmooth and form close mating fits, and with the thus modified retainerring in position on the thus modified mounting member in clampingrelationship to wall portion 109, the retainer ring is welded, riveted,swaged or otherwise fixedly mounted on the mounting member. Appropriatetools may be used to hold the retainer ring and mounting member tightclamping relationship to the keg wall portion 109 while they are fixedlysecured to one another.

By making the kegs of plastic, they do not dent like metal barrels, andare much quieter when being handled, including during transport andfilling operations.

What is claimed is:

l. A container for beer comprising a keg having unitarily continuoustop, bottom and side walls of plastic defining a keg chamber, one ofsaid walls having an opening therethrough that opens into the kegchamber and exterior and interior surfaces surrounding the opening, amounting member mounted by the one wall to extend through the wallopening and having a central opening therethrough, said mounting memberhaving a first annular flange extending through and outwardly of thewall opening and extending in close fitting relationship with the wallportion defining said opening, a second annular flange having an outerdiameter substantially larger than the maximum outer diameter of thefirst flange, joined to the first flange and bearing against the wallinterior surface, and a tooth joined to the second flange and protrudinginto the wall portion, and a retainer ring mounted on the second flangeand bearing against the wall exterior surface to clamp the wall portionbetween said ring and first flange.

2. The apparatus of claim 1 further characterized in that the firstflange extends axially away from the second flange, that the secondflange has a surface portion adjacent the wall inner surface and thatthe tooth extends axially relative the second flange in the samedirection as the first flange to a position more closely adjacent theretainer ring than the second flange surface portion.

3. The apparatus of claim 2 further characterized in that the tooth incross section in a plane parallel to the central axis of the firstflange is substantially triangular and has a terminal apex more closelyadjacent the retainer ring than the second flange.

4. The apparatus of claim 2 further characterized in that there areprovided a plurality of teeth joined to said second flange, said teethbeing angularly spaced and extending radially relative the first flange.

5. The apparatus of claim 2 further characterized in that said toothextends annularly and is of a substantially larger radius of curvaturethan the maximum diameter of the first flange.

6. The apparatus of claim 5 further characterized in that the secondflange'surface portion is annular and extends between the tooth and thefirst flange.

7. The apparatus of claim 6 further characterized in that the secondflange surface portion bears against the wall interior surface.

8. The apparatus of claim 6 further characterized in that a gasket isprovided between the second flange surface portion and the keg wallinner surface, the axial height of the first flange being substantiallygreater than the tooth.

9. The apparatus of claim 6 further characterized in that the retainerring has an annular tooth and an annular surface surrounded by the ringtooth that bears against the wall exterior surface, said ring toothextending more closely adjacent the second flange than the ring annularsurface.

10. The apparatus of claim 9 further characterized in that the retainerring has a second annular surface surrounding the tooth, said ringannular surfaces being generally coplanar, the outer diameter of thesecond annular surface being substantially larger than the outerdiameter of the second flange.

11. A container for beer comprising a keg having integrally joined top,bottom and side walls defining a keg chamber, said walls being made ofunitary formed plastic, said side wall having a portion defining a plugmounting member opening and said top wall having a portion defining atapper plug mounting member opening, a filler plug mounting membermounted in the side wall opening by said side wall portion, and a tapperplug mounting member mounted in said top wall opening in adheredrelationship to the top wall portion, said filler plug mounting memberhaving a first annular flange that has an annular surface bearingagainst the inner surface of the side wall, the first annular flangehaving an outer diameter greater than the side wall opening, and asecond annular flange integrally joined to the first flange to extendoutwardly through the side wall opening and having external threads, anda retainer nut threaded on the second flange to bear against the outersurface of the side wall, the first flange having a flat surface portionand a tooth extending axially relative the flat surface portion to aposition more closely adjacent the nut than the flat surface portion.

12. A container for beer comprising a keg having unitarily continuoustop, bottom and side walls of plastic defining a keg chamber, one ofsaid walls having an opening therethrough that opens into the kegchamber and exterior and interior surfaces surrounding the opening, amounting member mounted by the one wall to extend through the wallopening and having a central opening therethrough, said mounting memberhaving a first annular flange extending through and outwardly of thewall opening and extending in close fitting relationship with the wallportion defining said opening, a second annular flange having an outerdiameter substantially larger than the maximum outer diameter of thefirst flange, joined to the first flange and bearing against the wallinterior surface, and a retainer ring mounted on the first flange andbearing against the wall exterior surface to clamp the wall portionbetween said ring and second flange, said ring having an annular toothand an annular surface surrounded by the ring tooth that bears againstthe wall exterior surface, said tooth extending more closely adjacentthe second flange than the ring annular surface.

13. The container of claim 12 further characterized in that the toothhas an apex edge remote from the annular surface.

14. The container of claim 12 further characterized in that said firstflange and ring have threaded portions forming a mating fit.

# s a: s s

gigs UNITED STATES PATENT OFFICE CERTIFICATE OF CQRRECTION Patent No. 31145 Dated J ly 23 1974 Inventor(s) Richard W. Reynolds It is certifiedthat error appears in the above-identified patent and that said LettersPatent are hereby corrected as shown below:

Column 1, line 13 'for" should be --of- Column 2, line 41 "walls' shouldbe --wall--; Column 2, line 41 "member' should be --chamber-- Column 3,line 2 "wite" should be -with-- Column 3, line 47 "the" should beomitted.

Signed and sealed this 8th day of October 1974.

(SEAL) Attest: v

MCCOY M. GIBSON JR. c. MARSHALL DANN Attesting Officer Commissioner ofPatents

1. A container for beer comprising a keg having unitarily continuoustop, bottom and side walls of plastic defining a keg chamber, one ofsaid walls having an opening therethrough that opens into the kegchamber and exterior and interior surfaces surrounding the opening, amounting member mounted by the one wall to extend through the wallopening and having a central opening therethrough, said mounting memberhaving a first annular flange extending through and outwardly of thewall opening and extending in close fitting relationship with the wallportion defining said opening, a second annular flange having an outerdiameter substantially larger than the maximum outer diameter of thefirst flange, joined to the first flange and bearing against the wallinterior surface, and a tooth joined to the second flange and protrudinginto the wall portion, and a retainer ring mounted on the second flangeand bearing against the wall exterior surface to clamp the wall portionbetween said ring and first flange.
 2. The apparatus of claim 1 furthercharacterized in that the first flange extends axially away from thesecond flange, that the second flange has a surface portion adjacent thewall inner surface and that the tooth extends axially relative thesecond flange in the same direction as the first flange to a positionmore closely adjacent the retainer ring than the second flange surfaceportion.
 3. The apparatus of claim 2 further characterized in that thetooth in cross section in a plane parallel to the central axis of thefirst flange is substantially triangular and has a terminal apex moreclosely adjacent the retainer ring than the second flange.
 4. Theapparatus of claim 2 further characterized in that there are provided aplurality of teeth joined to said second flange, said teeth beingangularly spaced and extending radially relative the first flange. 5.The apparatus of claim 2 further characterized in that said toothextends annularly and is of a substantially larger radius of curvaturethan the maximum diameter of the first flange.
 6. The apparatus of claim5 further characterized in that the second flange surface portion isannular and extends between the tooth and the first flange.
 7. Theapparatus of claim 6 further characterized in that the second flangesurface portion bears against the wall interior surface.
 8. Theapparatus of claim 6 further characterized in that a gasket is providedbetween the second flange surface portion and the keg wall innersurface, the axial height of the first flange being substantiallygreater than the tooth.
 9. The apparatus of claim 6 furthercharacterized in that the retainer ring has an annular tooth and anannular surface surrounded by the ring tooth that bears against the wallexterior surface, said ring tooth extending more closely adjacent thesecond flange than the ring annular surface.
 10. The apparatus of claim9 further characterized in that the retainer ring has a second annularsurface surrounding the tooth, said ring annular surfaces beinggenerally coplanar, the outer diameter of the second annular surfacebeing substantially larger than the outer diameter of the second flange.11. A container for beer comprising a keg having integrally joined top,bottom and side walls defining a keg chamber, said walls being made ofunitary formed plastic, said side wall having a portion defining a plugmounting member opening and said top wall having a portion defining atapper plug mounting member opening, a filler plug mounting membermounted in the side wall opening by said side wall portion, and a tapperplug mounting member mounted in said top wall opening in adheredrelationship to the top wall portion, said filler plug mounting memberhaving a first annular flange that has an annular surface bearingagainst the inner surface of the side wall, the first annular flangehaving an outer diameter greater than the side wall opening, and asecond annular flange integrally joined to the first flange to extendoutwardly through the side wall opening and having external threads, anda retainer nut threaded on the second flange to bear against the outersurface of the side wall, the first flange having a flat surface portionand a tooth extending axially relative the flat surface portion to aposition more closely adjacent the nut than the flat surface portion.12. A container for beer comprising a keg having unitarily continuoustop, bottom and side walls of plastic defining a keg chamber, one ofsaid walls having an opening therethrough that opens into the kegchamber and exterior and interior surfaces surrounding the opening, amounting member mounted by the one wall to extend through the wallopening and having a central opening therethrough, said mounting memberhaving a first annular flange extending through and outwardly of thewall opening and extending in close fitting relationship with the wallportion defining said opening, a second annular flange having an outerdiameter substantially larger than the maximum outer diameter of thefirst flange, joined to the first flange and bearing against the wallinterior surface, and a retainer ring mounted on the first flange andbearing against the wall exterior surface to clamp the wall portionbetween said ring and second flange, said ring having AN annular toothand an annular surface surrounded by the ring tooth that bears againstthe wall exterior surface, said tooth extending more closely adjacentthe second flange than the ring annular surface.
 13. The container ofclaim 12 further characterized in that the tooth has an apex edge remotefrom the annular surface.
 14. The container of claim 12 furthercharacterized in that said first flange and ring have threaded portionsforming a mating fit.